ECHINODEEMS FROM WEST AUSTRALIA. 249 
Centeostephanus TENUISPINUS. 
H. L. Clark, 1914, Rec. W. Austral. Mus. i. p. 162. 
There are three half-grown but typical examples of this western species, 
one of which was taken in the lagoon at Pelsart Isle, while the other two 
were dredged off Long Island. 
Amblypneustes pallidus. 
Ecfdnus pallidus Lamarck, 1816, A.nim. s. Vert. iii. p. 48. 
Amblypneustes pallidus Valenciennes, 1846, Voy. 'Venus,' Zoophytes, pi. ii. fig. 1. 
A small Amblypneustes from Wooded Island, about 20 mm. in diameter 
and nearly 20 mm. high, is best referred to this species, although the diamond- 
shaped markings on the interambulacra are very faint. The test is faintly 
pink, the secondary and miliary spines dirty whitish, and the primaries are 
pale red. There are no spines on the anal system, and the tuberculation of 
the test is that which is characteristic of A. pallidus. 
Salmacis virgulata alexandri. 
Salmaeis alexandri Bell, 1884, ' Alert ' Rep. p. 118. 
Salmacis virgulata alexandri Doderlein, 1914, Ecli. Siidwest. Aust. p. 4-54. 
This urchin has already been recorded from Geraldton and from Sharks 
Bay, so the occurrence of two large specimens (74 and 79 mm. respectively 
in horizontal diameter) from the Abrolhos is not snrprising. They were 
dredged off Long Island. One has a low ambitus and flat oval surface, though 
the test is fairly high, while the other has a lower test and the ambitus mtich 
nearer to the mid-zone. In the latter specimen the [irimary spines are green, 
though the test is light purple, only the primaries near the peristome being 
somewhat purple near the base. In the larger specimen the primaries, as 
well as the test, are purple, but those below the ambilus are much longer and 
more brightly coloured than those above, and all are tipped with white. 
PbEUDOBOLETIA INDIANA. 
To.ropneustes indianus Miclielin, 1862, Ech. et Stel. : Annexe A, in Maillard's Notes 
sur Bourbon, p. 5. 
Pseudoboletia indiana A. Aga.ssiz, 1872, Rev. Ech. pt. 1, p. 153. 
The occurrence of a Pseudoboletia on the western side of the Australian 
continent is a discovery of more than ordinary interest, as the genus has not 
hitherto been reported from Australia or the Torres Strait region. But 
the present specimen, 50 mm. in diameter, with a dirty white coloration 
lacking all indication of pink, is unmistakable. It was dredged off Long- 
Island . 
Tripnet'stbs gratilla. 
Ecliinus yratilla Linng, 1758, Syst. Nat. ed. x. p. 664. 
Tripneusfes yratilla Loveii, 1887, Ech. Linn. p. 77. 
Two specimens, 68 and 86 mm. in diameter, with dark test and white 
linn. JOURN. ZOOLOGY, VOL. XXXV. l8 
